There have been a few more written previews of Expeditions: Viking since PAX East, such as this one at MMORPG.com, but there's still no proper footage of the game's new demo. The best thing for now is this interview with Alex Mintsioulis at a YouTube channel called GlitchFeed, which contains a few disjointed snippets of gameplay. Check it out:

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The characters look better to me than they did in the videos from GDC. Maybe it's the lighting.